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2024-01-29T18:57:19Z urn:hdl:10324/65230 Nonadiabatic Kohn Anomaly in Heavily Boron-Doped Diamond Serrano Gutiérrez, Jorge We report evidence of a nonadiabatic Kohn anomaly in boron-doped diamond, using a joint theoretical and experimental analysis of the phonon dispersion relations. We demonstrate that standard calculations of phonons using density-functional perturbation theory are unable to reproduce the dispersion relations of the high-energy phonons measured by high-resolution inelastic x-ray scattering. On the contrary, by taking into account nonadiabatic effects within a many-body field-theoretic framework, we obtain excellent agreement with our experimental data. This result indicates a breakdown of the Born-Oppenheimer approximation in the phonon dispersion relations of boron-doped diamond. 2024-01-29T18:57:19Z 2024-01-29T18:57:19Z 2017 info:eu-repo/semantics/article Phys. Rev. Lett. 119, 017001 (2017) https://uvadoc.uva.es/handle/10324/65230 10.1103/PhysRevLett.119.017001 eng info:eu-repo/semantics/openAccess American Physical Society